| 摘要 |
<p>A system switching over method and apparatus for duplicated ATM (asynchronous transfer mode) switch, which enables keeping the delay quality of each cell unchanged without any cell loss, are realized. At the time of system switching over, the system-switching control unit in each system (a system previously in operation and a system newly in operation) mutually communicates each other and manages a temporary cell storage unit, in which cells to be read out are stored in accordance with the delay priority group, in each system, and reads out cells in the order of higher delay priority whichever the system is. A delay priority selector in the system of an operation state is controlled to provide a cell read out path for outputting cells depending on a system from which the cell being read out. <IMAGE></p> |
